Why? The other two are grammatical mistakes. This one is not. That they’re not under contract yet doesn’t mean they can’t hold out. Signed or not, the team still owns their exclusive rights for a period. If they are not in camp, they’re holding out.
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If he had an existing contract and was not in camp, he’d be a hold out. He has yet to sign his name to a contract, so that’s not a hold out. He’s simply unsigned.

Why? The other two are grammatical mistakes. This one is not. That they’re not under contract yet doesn’t mean they can’t hold out. Signed or not, the team still owns their exclusive rights for a period. If they are not in camp, they’re holding out.